RDM is fine except when they die post-lucid. I personally would like to see them get an ability to restore their MP based on how much they're missing. That way it's specifically meant to help out when they're low rather than solve the need for Lucid entirely. Make it an oGCD that deals damage too, and call it Osmose.

I'd also like to see them get Verblizzard/water and have them be mana spender/conversion spells and lower the CD of Manafication so the focus of RDM shifts from spamming VerAero/thunder to get to 80/80 mana asap to getting to 40/40 mana and not going over 50/50 till you can pop Manafication and go into your melee combo.